Step 1: Cook the Pasta. Bring a large pot of salted water to a boil and cook pasta according to package instructions until al dente, about 8-10 minutes. Drain and rinse under cold water.

Step 2: Prepare the Salsa. Dice tomatoes into bite-sized pieces and combine with chopped basil and minced garlic in a mixing bowl. Gently mix and set aside.

Step 3: Whisk the Dressing. In a small bowl, combine olive oil and balsamic vinegar. Season with salt and pepper, and whisk until emulsified.

Step 4: Combine Everything. In a large serving bowl, combine cooled pasta with salsa mixture and drizzle dressing over. Toss gently to combine. Add optional mozzarella and red onion if desired.

Step 5: Serve and Enjoy. Let the salad rest for about 10 minutes, serve chilled or at room temperature with garnishes as desired.